DS3820MAUD1A1B

About the DS3820MAUD1A1B

The DS3820MAUD1A1B is a PCB/HMI designed as a component for the Mark IV series, which manages gas/steam turbines.  The Mark IV is built on integrated microcomputers that manage the turbine with intentional backups to minimize downtime and increase the reliability of the system.

The DS3820MAUD1A1B is stamped in the center of its front panel “General Electric.  Directo-Matic Plus Control System Freeway Media Access Module.” The DS3820MAUD1A1B is an HMI panel built on top of the DS3800HMAC printed circuit board.   The panel itself is designed with four cable connectors.  These are labeled on the front panel as JB, JC, JD and JE.  JB and JC belong to Cable A, and JD and JE belong to Cable B.   The panel has three cutouts on its front. One is labeled “Cable A OK,” and the second is labeled “Cable B OK.”  The last cutout is marked “Watch Dog Timer OK.” The front panel also has two locations marked JA-Link Controller Connector and JG-Power Connector.  The panel is marked DS3820MAUD, and is also marked with the code NP237B8406P1.

The PCB below the panel is built with six light emitting diodes.  These show through the cutouts on the panel above. The board has one six-pin header and one PCB mating connector marked 218A4837-P12.  It has six test points; these are labeled RXA, RXB, RCFG, DCOM, OXMIT, and 1RCV. The board has ten jumpers, two transistors, and forty circuits, including J-K negative edge triggered flip-flops, oscillating chips, and hex buffers.

The HMI and PCB connect together with six screws (located at the front of the panel) and two pins that slip over two vertical nylon spacers attached to the PCB (located at the back) and locked into place by nylon clips.  DS3820MAUD1A1B had technical support from GE.